Tune the default __repr__() implementation
Tune the default __repr__() implementation

Omit the polymorphic identity column, because the information is already
present in the class name. Also omit columns that have been marked as
deferred by default, because either they are not interesting or too
expensive to load.

Change-Id: I6e4b0b9fc91bdb891f2959995833fc7785e1e658

Reviewed-By: Priya Joshi <3c6cfa6f57440adfc837c4ad04483313acbc2582@morganstanley.com>

stdweird/aquilon,stdweird/aquilon,quattor/aquilon,guillaume-philippon/aquilon,quattor/aquilon,guillaume-philippon/aquilon,stdweird/aquilon,quattor/aquilon,guillaume-philippon/aquilon